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Stairs
First of all it is spelled as 'SCALENE' , not 'scelene'. The properties are := #1 Three unequal angles , summing to 180 degrees #2 Three unequal sides #3 It may have one obtuse angle.
Its diagonals are perpendicular and intersect each other at right angles or 90 degrees with 1 pair of opposite angles equal in size and 1 pair of unequal opposite angles
Irregular pentagon.
They are alike because their exterior angles add up to 360 degrees They are different because the interior angles of a pentagon add up to 540 degrees and the interior angles of an octagon add up to 1080 degrees